Skin Ph; Principle; The P Hprobe; Calibration - Cortexa Technology DermaLab Mini Instructions For Use Manual

11 Skin pH

11.1 Principle

The pH probe measures the pH potentiometrically on the skin surface using a glass probe espe-
cially developed for surface measuring.
11.2 The pH probe
The pH glass probe is fragile and will easily be destroyed if not handled carefully. The probe is
made of different layers of glass and thereby it can easily break. Be careful making sure you
never bend the probe or press on the side of the probe.
But most importantly be sure the probe is always stored in its holder and always covered by the
KCl storage buffer solution. The tip of the pH probe must never dry out.
When the pH probe is not used, then the probe - inserted in the storage chamber - should be
placed in the main unit. This will ensure the probe tip is covered by the storage buffer solution.
Remember to check from time to time that the probe tip is still covered by the storage buffer solu-
tion.
If the probe dries out, please try to recover it by placing the probe tip in a cup of tap water for 24
hours. This may recover the probe.

11.3 Calibration

The pH probe shall be calibrated regularly and at least:
•
At first use.
•
Every morning before use. Make a check pH measurement on the pH7 and pH4 refer-
ence solutions and make a new recalibration when the check measurement is outside
your tolerance range for the pH measurement.
Except for the first time, the probe must be cleaned prior to calibration. Cleaning is done in the fol-
lowing way:
•
Rinse the probe tip under fresh tap water.
•
Fill a plastic cup with tap water and add a few drops of mild detergent (like dishwashing
liquid) and gently stir the probe tip in the mixture.
•
Rinse the probe tip under well running tap water to remove all remains of the detergent.
Calibrate the probe at the same operating temperature as the probe will be used at.
REMEMBER: If it dries it dies!
When the pH Probe is not used, it shall be inserted into the storage
chamber holding the storage buffer solution. The cap on the storage
chamber can be turned left/right to loosen/tighten the grip on the side of
the probe. Loosen the cap when you wish to take out the probe for meas-
urements and tighten again after placing the probe back into the cham-
ber.
Cap on storage chamber. Loosen the cap before taking out the probe.
Fasten again when the probe is not used. This will ensure the storage
buffer solution will not leak or evaporate.
Storage chamber. Make sure the storage chamber is filled with ample
storage buffer solution. This will ensure the tip of the probe is fully sub-
merged in the storage buffer solution.
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